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Crystallographic and Magnetic Structure of the Perovskite-Type Compound BaFeO2.5: Unrivaled Complexity in Oxygen Vacancy Ordering

Clemens, Oliver ; Gröting, Melanie ; Witte, Ralf ; Perez-Mato, J. Manuel ; Loho, Christoph ; Berry, Frank J. ; Kruk, Robert ; Knight, Kevin S. ; Wright, Adrian J. ; Hahn, Horst ; Slater, Peter R. (2014)
Crystallographic and Magnetic Structure of the Perovskite-Type Compound BaFeO2.5: Unrivaled Complexity in Oxygen Vacancy Ordering.
In: Inorganic Chemistry, 53 (12)
doi: 10.1021/ic402988y
Article, Bibliographie

Abstract

We report here on the characterization of the vacancy-ordered perovskite-type structure of BaFeO2.5 by means of combined Rid-veld analysis of powder X-ray and neutron diffraction data. The compound crystallizes in the monoclinic space group P2(1)/c [a = 6.9753(1) angstrom, b = 11.7281(2), c = 23.4507(4) angstrom, beta = 98.813(1)degrees, and Z = 28] containing seven crystallographically different iron atoms. The coordination scheme is determined to be Ba7(FeO4/(2)),(FeO3/2O1/1)(3)(FeO5/2)(2)(FeO6/2)(1) = Ba7Fe1[6],(Fe2Fe4O17.5)-Fe-[4]-O-[4] and is in agreement with the Fe-57 Mossbauer spectra and density functional theory based calculations. To our knowledge, the structure of BaFeO2.5 is the most complicated perovskite-type superstructure reported so far (largest primitive cell, number of ABX(2.5) units per unit cell, and number of different crystallographic sites). The magnetic structure was determined from the powder neutron diffraction data and can be understood in terms of "G-type" antiferromagnetic ordering between connected iron-containing polyhedra, in agreement with field-sweep and zero-field-cooled/field-cooled measurements.

Item Type: Article
Erschienen: 2014
Creators: Clemens, Oliver ; Gröting, Melanie ; Witte, Ralf ; Perez-Mato, J. Manuel ; Loho, Christoph ; Berry, Frank J. ; Kruk, Robert ; Knight, Kevin S. ; Wright, Adrian J. ; Hahn, Horst ; Slater, Peter R.
Type of entry: Bibliographie
Title: Crystallographic and Magnetic Structure of the Perovskite-Type Compound BaFeO2.5: Unrivaled Complexity in Oxygen Vacancy Ordering
Language: English
Date: 16 June 2014
Publisher: ACS Publications
Journal or Publication Title: Inorganic Chemistry
Volume of the journal: 53
Issue Number: 12
DOI: 10.1021/ic402988y
Abstract:

We report here on the characterization of the vacancy-ordered perovskite-type structure of BaFeO2.5 by means of combined Rid-veld analysis of powder X-ray and neutron diffraction data. The compound crystallizes in the monoclinic space group P2(1)/c [a = 6.9753(1) angstrom, b = 11.7281(2), c = 23.4507(4) angstrom, beta = 98.813(1)degrees, and Z = 28] containing seven crystallographically different iron atoms. The coordination scheme is determined to be Ba7(FeO4/(2)),(FeO3/2O1/1)(3)(FeO5/2)(2)(FeO6/2)(1) = Ba7Fe1[6],(Fe2Fe4O17.5)-Fe-[4]-O-[4] and is in agreement with the Fe-57 Mossbauer spectra and density functional theory based calculations. To our knowledge, the structure of BaFeO2.5 is the most complicated perovskite-type superstructure reported so far (largest primitive cell, number of ABX(2.5) units per unit cell, and number of different crystallographic sites). The magnetic structure was determined from the powder neutron diffraction data and can be understood in terms of "G-type" antiferromagnetic ordering between connected iron-containing polyhedra, in agreement with field-sweep and zero-field-cooled/field-cooled measurements.

Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 16 Feb 2015 13:19
Last Modified: 16 Feb 2015 13:19
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